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Acquisition (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2017
Business Acquisition [Line Items]    
Net loss $ (9,066) $ (21,690)
Basic net loss per share (usd per share) $ (1.61) $ 4.92
Diluted net loss per share (usd per share) $ (1.61) $ 4.92
Conversion of convertible notes $ 5,800 $ 5,800
Goodwill and intangible assets impairment loss 5,200 5,200
Business acquisition, transaction costs 3,300 3,300
Historical Interest Expense    
Business Acquisition [Line Items]    
Pro forma adjustments to net loss $ 200 $ 300